Sexual Assault Support Services chief executive Liz Little is reserving her judgment on the decision to release the 56-year-old until she has seen the conditions of his parole.

But she would be concerned if he did not face strict reporting conditions, and said ``he is a repeat sex offender meaning the risk that he might reoffend would be quite critical''.

Mr Farmer was granted parole on December 1 and released from Hayes Prison Farm on Monday.

The Tasmanian Parole Board will post its decision online today.

A spokesman for the Department of Justice said the publication was delayed to allow time for all Mr Farmer's victims to receive the statement ahead of its general release.

Mr Farmer was sentenced to eight years' jail in 2004 on 14 counts of sexual misconduct, including six of rape.

The Court of Criminal Appeal increased that sentence to 10 years in 2005.

Mr Farmer used Rohypnol to drug and rape women at nightclubs he owned in Launceston and Hobart from 1990 to 2001.

He was also found guilty in 2003 of aiding and abetting Craig Peter Randall to rape an 18-year-old woman at Launceston's Playground nightclub in 1995.

Mr Randall was sentenced to five years' jail and died, aged 43, in Risdon prison in the final year of his sentence.

A 2009 inquest into his death found he was a diabetic who had refused to discuss the management of his condition with prison staff.

Mr Farmer, who owned the nightclub, received a 15-month jail sentence for his part in that rape.

Ms Little said she would be surprised and disappointed if his parole did not restrict him from working in a similar area upon his release.

``I really would like to know that he was under tight control for managing the risk that he poses - and the parole board has the power to manage that risk,'' she said.

Ms Little said Mr Farmer's ``chilling'' use of date-rape drugs to render women ``comatose'' was ``an assault on their sense of self''.

``He had absolutely no empathy, caring or feeling for the victims of this crime,'' she said.

``This man was driven by power and exploitation - they are characteristics of high-risk offenders.''

Ms Little said date-rape drugs were commonly used at clubs and pubs and advised people to use a buddy system to keep tabs on their friends when going out.

``Often people who have had their drink spiked don't know what happened . . . their life was taken away from them for a while,'' she said.

``If something weird happens to you and you lose a night in your life, it's not just getting hammered, it's something more that's happened to you.''

Ms Little advised anyone who found themselves with an unexplained memory gap to see a doctor, who may refer them to a sexual assault support service.